Exhaust system for paper-machine driers



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w. E. RosEBusl-i EXHAUST SYSTEM FOR PAPER MACHINE DRIERS Filed May 19, 1926 5 Shees--Sheeil l ATTORN EYS June` 7, 1927.

5 Sheets-Sheet 2 Filved May 19, 1926 lllllllll). .'Illlll l 1 l I |||.Il|||l1l wlTNEssEs ATTORNEYS 1,631,833 June 7 1927' w. E. Rosi-:BUSH

EXHAUST SYSTEM FOR PAPER MACHINE DRIERS Filed May 19, 1926 5 sheets-sneu 3 INVENTOR WITN E 35 ES C o 7L /M BY e ATTORNEYS v V1,631,833 June 7 1927 w. E. RosEBUsH EXHAUST SYSTEM FOR PAPER MACHINE DRIERS Filed May 19, 1926 5 Sheets-Sheet 4 ATTORNEYS 5 Sheets-Sheet 5 W. E. ROSEBUSH EXHAUST SYSTEM FOR PAPER MACHINE DRIERS Filed May 19, 1926 wf m m fw m A Q E Q Q Q w o G i i i w. Q Q Q Q u||||||1| NIM -.||||\|||.M |||||x|||||||| H 1| uw H u H m||||||| w |1 IN1. rllJ J QN )N N L Y 6 Q Q 'Elm F mi ICLZC N 1%. 1 .,'fiun? mi ww ,QN i EN i w wN @N u /V w June 7, 1927.

i air again used.

Patented June 7, 1927.

UNITED STATES WALDO E. ROSEBUSH, OF MILLWOOD, WASHINGTON.'

EXHAUST SYSTEM FOR PAPER-MACHINE- DItIIl'ilIEtS.`

Application led May 19, 1926. Serial No. 110,220.

This invention relates to an improved I system of exhausting the hot moist air from paper machine driers and has for an object to provide a simple construction which will eficiently remove the moist air from adjacent the driers while permitting new air to take the place of the moist air.

Another object of the invention is to provide an exhaust system forr paper machine driers which will prevent condensation in the room containing the` driers without the necessity of installing extra hot air pipes or other Ventilating system.

A further object of the invention is to provide a system of exhaust for paperma! chine driers wherein the water from the moist air is condensed and the resulting hot water guided to places where the same may be used in the plant.

An additional object is .to provide an exhaust system for removing moist air' from driers wherein the heatv in the air is conserved to a reasonable extent and the heated Another object, more specifically, is to provide a construction wherein the moist hot air is separated at the source from the -dry hot air through the use of a hood over thedrier section of the paper machine.

In the accompanying drawings- Figure l is a transverse sectionalview through a shed or housing with certain mechanism vshown in connection therewith, illustrating an lembodiment of the. `invention. l

Figure 2 is a sectional view through Figure 1, approximately on line 2 2.

Figure 3 is an enlarged detail view partly in elevation and partly in section, vshowing the exhaust pipes leading fromthe driers to condensing and other apparatus arranged above the driers, the section being taken on line 3-3 of Figure 1.

Figure 4 is an enlarged sectional view 'through Figure 3, approximately on line Figure 5 is a fragmentary sectional view approximately on line 5 5 of Figure 4.

Figure 6 is an enlarged side view of a number of driers together with the hoods arranged thereon andv certain associated parts embodying certain features of the in-Y vention.

Figure 7 is an enlarged detail fragmentary sectional view showing the forma-A tion of, one of the suction heads.

7 Y Figure 8 is a bottom plan view of the head shown in Figure 7.

In forming the construction embodying the invention, a hood structure is arranged toenclose or partly enclose` the various driers and the hot moist airis draw-n up into this hood structure and exhausted out through a pipe leading preferably to a point above the building in which the driers are located. Th-e exhaust air is laden' withk moisture and is also comparatively hot. After the exhaust air reaches the desired point above the building, it is passed through certain cleaners hereinafter more fully described whereby the moisture is removed to a large extent Aand the air is also cooled to a certain extent. This cooled and` somewhat dried air is then forced downwardly to a desiredpo-int, heated and thenl again released in the room where the driers are located. IThe releasing of theiheated comparatively dry air in the room prevents condensation onthe walls of the room'and permits air to pass to the driers to take the place of the hot moist air drawn therefrom,

into the'hood. This method of circulating the air and conserving the heat is very desirable as it provides hot water for use in the plant using the driers and also conserves fuel by. using the heated air over and over. In the drying of paper, it has been found that for every pound of paper taken from the dry end of the machine, two

pounds of water are evaporated from the web of the paper in its passage through the, drier stack. The paper comes to the wet end of the driers, usually in all machines, at an approximate moisture content of around seventy per cent for the manufacture of most papers, especially newsprint. The passage of the paper through the driers is for the purpose of removing moisture'from' the Wet web 'so that the sheet will' have a resultant vwet content of approximately seven or eight per cent.

It will, of course, be evident that the drier, i

gears, frame, etc., become heated to an appreciable degree by the radiation and conduction of heat from the inner portion of 1.0.5

the machine, name-ly, from the drier shell. The heat emanating from these principal portions, namely, the frame, etc., does not contain moisture in the same sense that the heat emanating from the inner the .machine does. In other wor s, it is dry heat and as such can 'absorb a large amount ortions of of moisture. This dry heat by reason of the construction involved is allowed to remain in the room andrise to the roof and spread out over the room so as to tend to Lconserve the amount of air necessary to be handled in order to keep the room dryand free from condensation. rI"his heat also in the winter time would provide almost enough heat to keep the roomata comfortable temperature. To properly regulate -thefventilation in the room containing the driers, the building` is preferably provided with a number of sashes in the roof which may be controlled from the floor. Y

In Figure 1, a cross section is vshown through a building equipped with a number of driers and with an exhaust system disclosing an embodiment of the invention. From this ligu'e it will beseen that the building 1 is provided with a room 2 in which the various driers 3 are arranged. A Hoor 4 is provided which is open below the various driers 3l so that air may freely enter and pass upwardly to the` driers from the basement 5. It will be noted that the buildingl is provided withy sidev walls 6 and-a top or roof structure 7. The driers 3 may be of any desired or preferred construction and include a number of drying steam rollers and also a number of felt rollers whereby the paper may be properly guided and dried in an approved manner. The specific const-ruction of the driers forms no part of the present invention.

In'connectlon with each series of driers erably formed into sections 9 for easy mounting, though the hood could be. made as one structure without departing from the spirit "of the invention Associated with the lhood 8 areside walls or plates 10 (Figure 4.) Theseside walls or plates extend downwardly to near the lower felt roller 11. It will thus be seen that practically all the vspace where the steam .rises from the driers is enclosedby ,the plates 10 in association with the hood 8. Below the plates 10 there is ample room for workmen to reach in and remove pieces ofpaper from the various rolls., Also, the lower parts of the driers are exposed so that the .machine may be properly threaded from time to time. The hood 8 maybe supported in any desired manner, asfor instance, by suitable angle iron '.uprights and in fact, the hood Y8 is preferably made with a frame of. ribs of angle iron with sheet material covering the same. The lower wall "or bottom of the hood is, however, made of corrugated metal plates 12 as shown particularly in Fi v re 6.

n eachv of the sections 10 there is pre erably arranged two doors, namely, doors 13 and 14. These doors are pivotally mounted in any suitableway. as for instance,l by being secured to rods 15 extending through the there .is arranged a hood 8 which is pref-- side wallsof the hood. Each of the rods 15 is provided with a turned up portion 16 (Figure 42 which acts as a handle whereby pair of pipes 17 for each roller 11 and at the end o f each of these pipes there is provided a headVv 18 having an inclinedface 19, said inclined 4faces'being perforated .as shown in Figure 8. Each of the pipes 17 extends upwardly through the bottom 12 so -thatthey 5 are continually exhausting into the hood 8. When the device is in use, the

various doors 13 and llt are also either en-` tirely open or partly open according to their location in respect to the driers and also according to certainother conditions. .The hood 8 extends forthe full length overall of the driers in a given series and at a desired point there is provided an exhaust pipe 20 whereby the hood 8 is exhausted.

Preferably, the parts arev so proportionedand operated that there will be a slight suction or rarefaction in the hood 8 at all times. This will cause the liberated moisture from the vdriers to gradually and immediately move upwardly and away from the rollers whereby a maximum drying effect is secured. Preferably, the exhaust pipe 20is connected with hood '8 at about twosthirds the disany of these doors may be opened or all may f tance from the entrance of the wetl paper into the drying machines, though the positionof the exhaust pipe may be shiftedor,

varied as desired. The position is' preferably as described because the wet'paper first entering the machine does not give off much.

moisture until it has passed several of the dryingrollers. By vlocating the exhaust pipe 20 as described, the same is positioned at about the point where most of the moisture is given off and, consequently, aneflicientexhausting is secured. If there is more than one series of driers 3 in the building `1, as

for instance, three, as illustrated in Figure 1, each of these driers is provided with a hood 8 and each is provided with an exhaust pipe l20. These various exhaust pipes merge into the main exhaust pipe 21 which extends through the'roof 7 and horizontally along the roof to a desired point.. At the rpo'intvof bending of pipe 21,.there is provided a spray nozzle 22 as shown in Figure 3. This nozzle is provided with cold water through suitable pipes or hose 23 and 24 which may be controlled in any desired manwasher 26 will be easily deprived oflmost of the water therein so that the air entering the fan 27 will be almost free of water and cooler; though still at a rather high temperature. The air washer 26 may be of any standard kind, as for instance, what is commonlyknown on the market as. the Western. This washer contains a number of bafie plates maintained vcool by water and also by air. The fan 27 is driven by any 'suitable means, as for instance, an ordinary electric fmotor 28. This fan discharges into a series of members 29 known as eliminators. These eliminators are maintained cool by a spray of water vfrom the spray member 30 which is supplied with water through pipe 31, which pipe in turn is supplied with water through the pipe 32. The pipe 32 may be supplied with water 'from any suitable source and if desired,'pressure. The eliminators 29 present in fact substantially the same structhe movement of air therein. Sometimes it .ture as the air washers 26 and are used to remove additional moisture from the air after they leave :tan 27. After the air leaves the structure 33 containing the eliminators 29, it passes into 'a pipe 34 and from thence downwardly to the'basement 5.v An airvalve 36'is provided in pipe 34 so as to control is Adesired to add fresh air from the atmosphere and, consequently, a` pipe 37 is connected with pipe 34, sald pipe 37 extending through the wall 38. An air valve 39 is arranged in pipe 37 so'as to vary the amount of air supplied through this pipe. By) the method just described, the hot moist air is exhausted 'or draw-n away from the driers, moved to a position on the roof of the build-v ing, deprived of a large percentage of the molsture therein and some of the heat though not all. lThe comparatively dried air which is still comparatively warm, is forced downwardly through the pipe 34 to a heater 40 which maybe of any desired construction. A series of shutters 41 is arranged in pipe 34near heater: 40, said shutters opening to the atmosphere whereby additional air vmay be drawn in at this point if desired. After the air has passed through the heater 40, it enters the fan casing 42 and is forced by the fan upwardly 'and through the various pipes 43 to the discharge openings 44.. It will be noted that the `ipes 43 extend tonear the walls of the building 1 as shown 1n F igure 2 and discharge the .through the pipe 37.

heated air against the walls. This will cause the heated air to pass upwardly along the walls and from thence over the interior surface of the roof. This arrangement is very desirable as it prevents condensation in the room 2 Where the driers 3 are located. It

' will be noted that the fan 27 produces the desired suction or rarefaction in the hood 8 and associated parts andat the Sametime forces the cleaned or more or less dried air downwardly into the heater 40. Fan 42 acts to force the heated air into the r0om2 and.

preferably the fan 42 acts in a manner to maintain a slight pressure in room 2 above 'atmospheric pressure. This will prevent any .air entering room 2 other than through the pipes 43 whereby an even action of the driers may be secured. It will also be noted that the air cleaner 26 really isa condenserV for removing the moisture from the air and the resulting water may be drawn off through a suitable pipe and vused as desired.

In regard to the fan 27, it will be noted that in case this fan is operating at a greater capacity than vthe fan in the basement, the excess air escapes out of the condenser 33 ywhich is reallya series of eliminator plates and a casing having suitable openings. If for any reason, fan 27 should not be operating at the capacity of the fan in the basement, the ditferene required to satisfy the lower fan can be secured by air drawn through the condenser 33 or What I claim is:

. 1. vA system of exhausting the hot moist air from paper. machine driers. including a hood adapted to fit partly over the driers, means for exhausting the hot 'moist air from' the hood anddirecting the same to a distant point, means at said distant point for vby air drawn condensing the moisture in said air and reducing somewhat the temperature of the air, means for causing the cooled andcomparatively driedl air to be forced to a heater, means for heating the air at said heater, and means for directlng the heated air into the room in which the'driers are located, said means directing the air so that it willpass upwardly along/the side walls and along theV Munder Yside of the roof' orpreventing condensation.

2.' A system of exhausting hot moist air` from paper machine driers including means forming a building in which the driers are located, a hood for said driers, a fan for exhausting air from said hood, a condenser for condensing water in the air, a heater, means for directin has been condense therefrom whereby the air will enter said heater, and means including a fan for forcing-the air yfrom the heater c so that it will s read over the interior side walls of said bullding and the interior surface of the roof for preventing condensation the air after the water and at the same time providing heated air adjacent the driers.

3. A'system of exhausting the hot moist air from paper machine driers including a hoodgfor receiving the hot moist air directly froml the driers, a pipe for directing the hot moist air to a condenser, means for spraying Lcooling water into said pipe for reducing the temperature of the air, a heater for said air, means for forcing the air from said condenser to said heater, said means including a second condenser for eliminating additional moisture from the air, and means for directing the heated airinto the room in which the driers are located, said means directing the directing the air to the heater after the moisture has been condensed therefrom, and means for directing the heated air from said heater to points near the side walls of said building whereby condensation on the walls 'and roof of the building is prevented and the room in which the driers are mounted is supplied with comparatively dried heated air.

air from paper machine driers ahood for the i 5. In a system ofexhausting the hot moist driers, said hood including a pair of side.

6. In a system of exhausting hot moist ail" from paper machine driers a hood having enclosing means extending over part of the v driers, said hood also being formed with a series of depending pipes extending to a point adjacent the point of liberation .of moisture from the driers, each of said pipes having a perforated head at the intake end while at ,the opposite end the pipes lexhaust into the hood, and means for exhaustingsaid hood to a distant point. l

7. In a system of exhausting hot moist air frompaper machine driers a hood fo;` the driers, vsaid hood including a series of depending pipes extending to a point intermediate the height of the driers, said hood also including a floor arranged above the driers said floor being formed with a series o doors, manually actuated means for opening and closing the doors whereby the amount of suction through the doors may-be varied, and

means for ex iausting the hot moist air from a disthe hood and discharging the same at tant point.

y wALDo E. RosEBUsH. 

